CN110888548A - Display device and touch panel - Google Patents

Display device and touch panel Download PDF

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Publication number
CN110888548A
CN110888548A CN201910859430.1A CN201910859430A CN110888548A CN 110888548 A CN110888548 A CN 110888548A CN 201910859430 A CN201910859430 A CN 201910859430A CN 110888548 A CN110888548 A CN 110888548A
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China
Prior art keywords
electrodes
electrode
touch detection
wiring
vicinity
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CN201910859430.1A
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CN110888548B (en
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高田直树
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Japan Display Inc
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Japan Display Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04107—Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Position Input By Displaying (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Embodiments of the present invention relate to a display device and a touch panel. A display device according to an embodiment includes: a plurality of first electrodes arranged in a second direction so as to extend in the first direction; a plurality of second electrodes arranged in a first direction so as to extend in a second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings. When the distance between the first electrode and the wiring disposed in the vicinity of the second electrode is shorter than a predetermined value, a shield portion is formed on the second electrode. When the distance between the first electrode and the wiring disposed in the vicinity of the second electrode is longer than a predetermined value, the shield portion is not formed in the second electrode.

Description

Display device and touch panel
This application claims priority rights based on Japanese patent application 2018-169808 (application date: 2018, 9/11). This application is incorporated by reference herein in its entirety.
Technical Field
Embodiments of the present invention relate to a display device.
Background
In recent years, electronic devices such as smartphones and tablet computers have been widely spread. In such an electronic apparatus, a display device having a touch detection function (hereinafter, referred to as a display device with a touch detection function) is used.
In such a display device with a touch detection function, for example, contact or proximity of an object (external proximity object) such as a fingertip or a pen with respect to a display region (effective display region) can be detected.
Here, the touch detection function is realized by arranging a drive electrode and a touch detection electrode, but it is known that a parasitic capacitance is generated between the drive electrode and a wiring connected to the touch detection electrode.
The parasitic capacitance affects the accuracy of touch detection, and therefore generation of the parasitic capacitance is suppressed by forming, for example, a shield portion (shield pattern electrode).
However, even if the above-described configuration for suppressing the occurrence of the parasitic capacitance is adopted, the accuracy of touch detection may be degraded.
Disclosure of Invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a display device capable of suppressing a decrease in accuracy of touch detection.
According to an embodiment, a display device that displays an image in a display area is provided. The display device includes: a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction; a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings and detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes. When a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value, a shield portion is formed in the second electrode. When a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is longer than a predetermined value, the shielding portion is not formed in the second electrode.
According to an embodiment, a display device that displays an image in a display area is provided. The display device includes: a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction; a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings, detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes, in the case where the distance between the wiring arranged in the vicinity of one of the plurality of second electrodes and the first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value, a first shield portion is formed in the second electrode, and when a distance between a wiring line arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring line among the plurality of first electrodes is longer than a predetermined value, the second electrode is provided with a second shield portion, the first shield portion is formed at a position overlapping the first electrode, and the second shield portion is formed at a position not overlapping the first electrode.
According to an embodiment, a display device that displays an image in a display area is provided. The display device includes: a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction; a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings, detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes, in the case where the distance between the wiring arranged in the vicinity of one of the plurality of second electrodes and the first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value, a first shield portion is formed in the second electrode, and when a distance between a wiring line arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring line among the plurality of first electrodes is longer than a predetermined value, the second electrode is formed with a second shield portion, and an area of a portion where the second shield portion and the first electrode overlap each other is smaller than an area of a portion where the first shield portion and the first electrode overlap each other.
According to an embodiment, there is provided a touch panel including: a plurality of first electrodes overlapping the touch detection area and arranged in a second direction intersecting the first direction so as to extend in the first direction; a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings, and detecting a contact or approach of an object to the touch detection area based on electrostatic capacitances between the plurality of first electrodes and the plurality of second electrodes, wherein when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value, a shield portion is formed in the second electrode, and when a distance between the wiring arranged in the vicinity of one of the plurality of second electrodes and the first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is longer than the predetermined value, the shield portion is not formed in the second electrode.
According to an embodiment, there is provided a touch panel including: a plurality of first electrodes overlapping the touch detection area and arranged in a second direction intersecting the first direction so as to extend in the first direction; a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings, detecting contact or proximity of an object to the touch detection area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes, in the case where the distance between the wiring arranged in the vicinity of one of the plurality of second electrodes and the first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value, a first shield portion is formed in the second electrode, and when a distance between a wiring line arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring line among the plurality of first electrodes is longer than a predetermined value, the second electrode is provided with a second shield portion, the first shield portion is formed at a position overlapping the first electrode, and the second shield portion is formed at a position not overlapping the first electrode.
According to an embodiment, there is provided a touch panel including: a plurality of first electrodes overlapping the touch detection area and arranged in a second direction intersecting the first direction so as to extend in the first direction; a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction; a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and a touch detection driver connected to the plurality of wirings, detecting contact or proximity of an object to the touch detection area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes, in the case where the distance between the wiring arranged in the vicinity of one of the plurality of second electrodes and the first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value, a first shield portion is formed in the second electrode, and when a distance between a wiring line arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring line among the plurality of first electrodes is longer than a predetermined value, the second electrode is formed with a second shield portion, and an area of a portion where the second shield portion and the first electrode overlap each other is smaller than an area of a portion where the first shield portion and the first electrode overlap each other.
Drawings
Fig. 1 is a perspective view showing an example of a schematic configuration of a display device according to a first embodiment.
Fig. 2 is a diagram showing an example of a schematic configuration of a display panel provided in the display device.
Fig. 3 is a diagram schematically showing an example of a cross-sectional structure of a display device.
Fig. 4 is a diagram for explaining a basic operation of the touch detection mechanism.
Fig. 5 is a diagram for explaining an example of a relationship between a display period and a touch detection period in the display device.
Fig. 6 is a diagram schematically showing a positional relationship between the drive electrodes and the touch detection electrodes in the comparative example of the present embodiment.
Fig. 7 is a diagram showing an example of a connection portion between the touch detection electrode and the wiring.
Fig. 8 is a diagram for explaining a shield portion formed in the touch detection electrode.
Fig. 9 is a diagram schematically showing an example of the positional relationship between the drive electrodes and the touch detection electrodes in the present embodiment.
Fig. 10 is a diagram for specifically explaining the shield portion formed on the touch detection electrode.
Fig. 11 is a diagram showing a different arrangement example of the wiring connected to the touch detection electrode.
Fig. 12 is a diagram for explaining a shield portion formed in a touch detection electrode in the second embodiment.
Fig. 13 is a diagram for explaining a configuration in which the shield portion is formed at a position overlapping the drive electrode.
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings.
It should be noted that the present disclosure is merely an example, and a definition change which can be easily conceived by those skilled in the art within the scope of the gist of the invention is also included in the scope of the invention. In addition, the drawings are schematically illustrated in comparison with actual embodiments in order to make the description clearer, and are merely examples, and the present invention is not to be construed as being limited thereto. In each drawing, the same or similar constituent parts arranged in series may be omitted with reference numerals. In the present specification and the drawings, the same reference numerals are given to constituent elements that perform the same or similar functions as those described in the already-shown drawings, and overlapping detailed descriptions thereof may be omitted as appropriate.
(first embodiment)
First, the first embodiment is explained. Fig. 1 is a perspective view showing a schematic configuration of a display device according to the present embodiment. The display device according to the present embodiment is a display device having a touch detection function, and includes, as such a display device, a display device including a touch detection mechanism called an On-Cell system In which a touch panel is formed On a display surface of the display device, and a display device including a touch detection mechanism called an In-Cell system In which a common electrode for image display originally included In the display device is used as one of a pair of touch detection electrodes and the other electrode (touch detection electrode) is arranged so as to intersect the common electrode. In the following description, the display device according to the present embodiment is described as a display device including a touch detection mechanism called an In-Cell system.
The display device 10 shown in fig. 1 includes a display panel 11. As the display panel 11, a display panel using a liquid crystal layer as a display functional layer, a display panel using an organic light emitting layer (organic EL), or the like is used, and a display panel using a liquid crystal layer will be described here.
The display panel 11 includes a first substrate 111 (array substrate), a second substrate 112 (counter substrate) disposed to face the first substrate 111, and a liquid crystal layer (not shown) formed between the first substrate 111 and the second substrate 112. Note that, for example, a panel driver (liquid crystal driver) 113 for driving the display panel 11 is mounted on the first substrate 111. The panel driver 113 drives the display panel 11, thereby displaying an image in a display area DA (effective display area) of the display panel 11.
The display panel 11 is integrated with, for example, a capacitance change detection type touch detection mechanism 12.
The touch detection means 12 includes a plurality of touch detection electrodes Rx (second electrodes). The plurality of touch detection electrodes Rx are disposed on the second substrate 112 at positions overlapping the display area DA of the display panel 11. Further, the plurality of touch detection electrodes Rx extend in the X direction (second direction) and are arranged in line in the Y direction (first direction). The touch detection electrode Rx is, for example, a transparent electrode and is formed of a transparent conductive material such as ITO (indium tin oxide) or IZO (indium zinc oxide). Note that the touch detection electrodes Rx may be provided outside the display panel 11 or inside the display panel. The touch detection means 12 is connected to the touch detection driver 121 via a flexible printed circuit board FPC 2.
In the display panel 11, although not shown in fig. 1, the plurality of common electrodes (first electrodes) for image display are provided on the first substrate 111. In the present embodiment, the plurality of common electrodes are used as one of the touch detection electrodes and are disposed at positions facing the touch detection electrodes Rx. The common electrode is formed of ITO or the like, for example.
In the display device 10 according to the present embodiment, the contact or approach of an object (object) to the display area DA can be detected based on the capacitance (mutual capacitance) between the touch detection electrode Rx and the common electrode. Note that, although contact or proximity of an object can be detected in the display device 10, only the case of detecting contact of an object is described in the following description for convenience.
Further, for example, a host device HOS is provided outside the display panel 11, and the host device HOS is connected to the display panel 11 via the flexible printed circuit board FPC1 and the panel driver 113. The host device HOS is connected to the touch detection means 12 via the flexible printed circuit board FPC2 and the touch detection driver 121.
Note that the panel driver 113 and the touch detection driver 121 may be configured as the same chip. When the touch detection driver 121 and the panel driver 113 are formed as the same chip, the chip may be disposed on the second substrate 112, the flexible printed circuit board FPC1, or the flexible printed circuit board FPC2, so that the flexible printed circuit board FPC1, the flexible printed circuit board FPC2, or the like may be omitted.
A backlight unit 13 is disposed below the first substrate 111 (i.e., on the back surface side of the display panel 11) as a lighting fixture for illuminating the display panel 11. The flexible wiring substrate FPC3 connects the backlight unit 13 and the host device HOS. As the backlight unit 13, various types of backlight units are available, and as the light source, there are a light source using a Light Emitting Diode (LED), a light source using a Cold Cathode Fluorescent Lamp (CCFL), and the like. Here, although the case of using the backlight unit 13 disposed on the rear surface side of the display panel 11 is described, a front light disposed on the display surface side of the display panel 11 may be used. Further, a lighting fixture using a light guide plate and LEDs or cold cathode tubes arranged on the side of the light guide plate may be used, or a lighting fixture using a point-like light source in which light emitting elements are arranged in a planar manner may be used. Note that, when the display device 10 is a reflective display device or when the display panel 11 uses an organic EL, the display device 10 may be configured without a lighting fixture.
The display panel 11 in the present embodiment may be any of a transmissive type, a reflective type, and a semi-transmissive type. As described above, the display device 10 to which the transmissive display panel 11 is applied includes the backlight unit 13 on the rear surface side of the first substrate 111, and has a transmissive display function of selectively transmitting light from the backlight unit 13 to display an image. The display device 10 using the reflective display panel 11 has a reflective layer that reflects light at a position on the back side of the display panel 11 with respect to the liquid crystal layer, and has a reflective display function of selectively reflecting light from the front surface side (display surface side) of the second substrate 112 to display an image. Note that the reflective display panel 11 may be provided with an auxiliary light source on the front surface side. The reflective layer may be formed of a material having a reflective function such as metal, and the electrode positioned on the back side of the display panel 11 with respect to the liquid crystal layer may be formed. The display device 10 to which the semi-transmissive display panel 11 is applied has the transmissive display function and the reflective display function described above.
Fig. 2 shows a schematic configuration of the display panel 11 included in the display device 10. A plurality of pixels PX are arranged in a matrix on the display panel 11. Note that only 3 pixels PX are shown in fig. 2 for convenience.
Here, each of the plurality of pixels PX includes a pixel switch SW. The pixel switch SW includes a Thin Film Transistor (TFT), and is arranged near a position where a scanning line G extending along a row in which the plurality of pixels PX are arranged intersects a signal line S extending along a column in which the plurality of pixels PX are arranged.
The gate electrode of the pixel switch SW is electrically connected to the corresponding scanning line G. The source electrode of the pixel switch SW is electrically connected to the corresponding signal line S. Further, the drain electrode of the pixel switch SW is electrically connected to the corresponding pixel electrode PE. Note that the following may be configured: the source electrode of the pixel switch SW is connected to the corresponding pixel electrode PE, and the drain electrode of the pixel switch SW is connected to the corresponding signal line S.
The display panel 11 is provided with a gate driver GD and a source driver SD for driving the plurality of pixels PX. The plurality of scanning lines G are electrically connected to output terminals of the gate driver GD. The plurality of signal lines S are electrically connected to output terminals of the source driver SD.
The gate driver GD sequentially applies an on voltage to the plurality of scanning lines G, and supplies the on voltage to the gate electrode of the pixel switch SW electrically connected to the selected scanning line G. In the pixel switch SW, in which an on voltage is supplied to the gate electrode, the source electrode-drain electrode is turned on.
The source driver SD supplies a corresponding output signal to each of the plurality of signal lines S. A signal supplied to the signal line S is applied to the corresponding pixel electrode PE via the pixel switch SW that is turned on between the source electrode and the drain electrode.
Further, the display panel 11 includes a common electrode driver CD. The common electrode driver CD is a circuit that supplies a drive signal (applies a drive voltage) to the common electrode COME. The pixel electrode PE and the common electrode COME are disposed opposite to each other with an insulating film interposed therebetween. The pixel electrode PE, the common electrode COME, and the insulating film form a holding capacitor CS.
The gate driver GD, the source driver SD, and the common electrode driver CD are disposed in the peripheral region (frame) of the display panel 11 and controlled by the panel driver 113. In fig. 2, although not shown, the panel driver 113 controls the operation of the backlight unit 13.
In the display device 10, the panel driver 113 controls the gate driver GD, the source driver SD, the common electrode driver CD, the backlight unit 13, and the like, and can display an image in the display area DA.
Note that, although only one gate driver GD is illustrated in fig. 2, the display panel 11 may have a configuration including a plurality of gate drivers GD. For example, when two gate drivers GD are provided, for example, some of the plurality of scanning lines G are connected to one gate driver GD, and the remaining scanning lines are connected to the other gate driver. In this case, the two gate drivers are arranged to face each other with the plurality of pixels PX interposed therebetween, for example.
Fig. 3 is a view (cross-sectional view) schematically showing a cross-sectional structure of the display device 10. Note that, in fig. 3, only a partial sectional structure of the display device 10 is shown for convenience.
The display device 10 includes a display panel 11, a backlight unit 13, a first optical element OD1, and a second optical element OD 2.
Note that, although the display panel 11 has a configuration corresponding to an FFS (Fringe field switching) mode as a display mode in fig. 3, it may have a configuration corresponding to another display mode.
As described above, the display panel 11 includes the first substrate 111, the second substrate 112, and the liquid crystal layer LQ. The first substrate 111 and the second substrate 112 are bonded together with a predetermined cell gap formed therebetween. The liquid crystal layer LQ is held in a cell gap between the first substrate 111 and the second substrate 112.
The first substrate 111 is formed using a first insulating substrate 201 having optical transparency, such as a glass substrate or a resin substrate. The first substrate 111 includes a signal line S, a common electrode COME, a pixel electrode PE, a first insulating film 202, a second insulating film 203, a third insulating film 204, a first alignment film AL1, and the like on the side of the first insulating substrate 201 facing the second substrate 112.
Here, the pixel electrode PE and the common electrode COME constitute a pixel PX together with the pixel region of the liquid crystal layer LQ, and the pixel PX is arranged in the display panel 11 in a matrix as described above.
The first insulating film 202 is disposed on the first insulating substrate 201. Further, the signal line S is formed over the first insulating film 202. In the example shown in fig. 3, the signal line S extends in the Y direction.
Note that, although not shown, the scanning lines G, the gate electrodes of the switching elements (pixel switches SW), the semiconductor layers, and the like are disposed between the first insulating substrate 201 and the first insulating film 202. Further, source and drain electrodes of the switching element and the like are also formed on the first insulating film 202.
The second insulating film 203 is disposed on the signal line S and the first insulating film 202. The common electrode COME is formed over the second insulating film 203. The common electrode COME is composed of a plurality of segments. The segments of the common electrode COME extend in the Y direction (first direction) and are arranged in the X direction (second direction) at predetermined intervals. The common electrode COME is formed of a transparent conductive material such as ITO or IZO. In the example shown in fig. 3, a metal layer ML is formed over the common electrode COME, and the common electrode COME is reduced in resistance. Note that the metal layer ML may be omitted.
The third insulating film 204 is disposed on the common electrode COME and the second insulating film 203. The pixel electrode PE is formed over the third insulating film 204. Each pixel electrode PE is located between adjacent signal lines S, and is opposite to the common electrode COME. Each pixel electrode PE has a slit SL at a position facing the common electrode COME. Such a pixel electrode PE is formed of a transparent conductive material such as ITO or IZO. The first alignment film AL1 covers the pixel electrode PE and the third insulating film 204.
On the other hand, the second substrate 112 is formed using a second insulating substrate 205 having optical transparency, such as a glass substrate or a resin substrate. The second substrate 112 includes a black matrix BM, color filters CFR, CFG, CFB, a cover layer OC, a second alignment film AL2, and the like on the side of the second insulating substrate 205 opposite to the first substrate 111.
The black matrix BM is formed on the inner surface of the second insulating substrate 205, and partitions each pixel. The color filters CFR, CFG, CFB are formed on the inner surface of the second insulating substrate 205, and partially overlap the black matrix BM. The color filter CFR is a red filter, the color filter CFG is a green filter, and the color filter CFB is a blue filter. The cover layer OC covers the color filters CFR, CFG, CFB. The cover layer OC is formed of a transparent resin material. The second alignment film AL2 covers the cover layer.
Note that color filters, black matrixes, and the like may be formed on the first insulating substrate 201. In addition, the color filter may be stacked on, for example, the pixel electrode PE.
The touch detection electrode Rx is formed on the outer surface of the second insulating substrate 205. The touch detection electrodes Rx are arranged to extend in the X direction. Note that, although not shown in fig. 3, the plurality of touch detection electrodes Rx are arranged in the Y direction.
The touch detection electrode Rx is formed of a transparent conductive material such as ITO or IZO as described above, but may be formed of a metal material such as aluminum (Al), titanium (Ti), silver (Ag), molybdenum (Mo), tungsten (W), copper (Cu), or chromium (Cr), an alloy of these metal materials, a conductive organic material, or a dispersion of a fine conductive substance. The touch detection electrode Rx may be a single layer body formed of the above material, or may be a laminated body. In one example of the laminate, the touch detection electrode Rx may be configured to include a thin metal wire made of the metal material and a transparent conductive material. When a metal material is used for the touch detection electrode Rx, grid processing may be performed, and it is preferable to perform non-visualization processing such as plating processing using a black material.
The backlight unit 13 is disposed on the rear surface side of the display panel 11 as described above. The first optical element OD1 is disposed between the first insulating substrate 201 and the backlight unit 13. The second optical element OD2 is disposed on the touch detection electrode Rx. The first optical element OD1 and the second optical element OD2 each include at least a polarizer. The first optical element OD1 and the second optical element OD2 may be configured to include a phase difference plate, if necessary.
Fig. 4 is a diagram for explaining a basic operation of the touch detection mechanism 12. Fig. 4 illustrates a touch detection operation (an operation of detecting an object contact) based on a mutual capacitance (mutual) detection method.
In the touch detection mechanism 12 of the mutual capacitance detection method, a touch detection function is realized by, for example, the touch detection electrodes Rx formed in a stripe shape in the X direction on the second substrate 112 and the drive electrodes Tx formed in a stripe shape in the Y direction on the first substrate 111. As shown in fig. 4, the touch detection electrodes Rx and the driving electrodes Tx are in a crossing relationship with each other. As the driving electrode Tx, the common electrode COME for image display is used.
Note that the touch detection electrodes Rx may be formed in a stripe shape in the Y direction, and the driving electrodes Tx may be formed in a stripe shape in the X direction.
In such a configuration, the driving electrodes Tx are sequentially driven by a high-frequency pulse driving signal (touch driving signal). In this case, a signal of a lower level (hereinafter, referred to as a touch detection signal) is detected from the touch detection electrode Rx which an object such as a fingertip approaches than the output from the other touch detection electrodes Rx. This is because a second capacitance is generated between the touch detection electrode Rx and the fingertip in addition to the first capacitance generated between the touch detection electrode Rx and the drive electrode Tx which the fingertip approaches. That is, the touch detection electrode Rx can output a touch detection signal based on a change in electrostatic capacitance according to a fingertip.
The touch detection means 12 can discriminate the coordinate position (contact position) of the fingertip from the drive timing of the drive electrode Tx and the position of the touch detection electrode Rx from which a low-level detection signal is output.
Fig. 5 illustrates an example of the relationship between the display period and the touch detection period in the display device 10.
In the present embodiment, the display period includes a period during which a display operation (a driving operation for driving the display pixels PX by the gate driver GD and the source driver SD) for displaying an image in the display region DA is performed in the display panel 11. On the other hand, the touch detection period includes a period during which a touch detection operation (for example, an operation of supplying a touch drive signal to the drive electrode Tx to detect a touch detection signal) of detecting an object contact is performed in the touch detection mechanism 12.
Here, as the driving electrode Tx to which the touch driving signal is supplied during the touch detection period, a plurality of strip-shaped common electrodes COME are used as described above. That is, since the common electrode COME for displaying an image in the display area DA is also used as the drive electrode Tx for touch detection, the display operation and the touch detection operation are performed in a time-division manner (time division manner) in the present embodiment.
Specifically, as shown in fig. 5, the period during which 1 frame of image is displayed by the above-described display operation (hereinafter, referred to as a 1-frame period) is configured by a plurality of cells. The 1-cell is divided into the display period and the touch detection period. That is, in the 1-cell period, after an operation (display operation) of outputting a pixel signal (SIGn) for each color in accordance with a selection of a signal (SELR/G/B) for one of three colors of RGB is performed on a plurality of display lines (lines) (display period), an operation (touch detection period) of supplying a touch driving signal (driving pulse TxVCOM) to the common electrode COME as the driving electrode Tx is performed. As described above, since the 1-frame period is constituted by a plurality of cells, the display period and the touch detection period are alternately repeated in the 1-frame period.
The configuration of the display device 10 according to the present embodiment will be described in detail below. Although not shown in fig. 1, in the display device 10 according to the present embodiment, the display area DA (display panel 11) has a special-shaped shape. Note that, in the present embodiment, the irregular shape refers to a shape (a shape other than a rectangular shape) different from a rectangular shape such as a substantially square shape or a substantially rectangular shape. In the following, a display device in which the display area DA has a rectangular shape will be described as a comparative example of the present embodiment.
Fig. 6 is a diagram schematically showing the positional relationship between the drive electrodes Tx and the touch detection electrodes Rx in the comparative example of the present embodiment.
In the comparative example of the present embodiment, the plurality of driving electrodes Tx (common electrodes COME) are arranged in the X direction so as to extend in the Y direction. On the other hand, the plurality of touch detection electrodes Rx are arranged in the Y direction so as to extend in the X direction. Note that the plurality of driving electrodes Tx and the plurality of touch detection electrodes Rx are arranged at positions overlapping the rectangular display area DA.
In the display device according to the comparative example of the present embodiment, as shown in fig. 6, a wiring (lead line) 300 is connected to each of the plurality of touch detection electrodes Rx, and the touch detection driver 121 can receive a touch detection signal from each of the touch detection electrodes Rx through the wiring 300. The touch detection driver 121 can detect contact of an object to the display area DA based on such a touch detection signal.
Here, when the driving electrodes Tx and the touch detection electrodes Rx are in the positional relationship as shown in fig. 6, the wirings 300 connected to the respective touch detection electrodes Rx are arranged along the driving electrodes Tx.
In this case, when a drive signal is supplied to, for example, a drive electrode Tx (hereinafter, referred to as a drive electrode Tx1) disposed near the wiring 300 (at the right end in fig. 6) among the plurality of drive electrodes Tx, an electric field (fringe electric field) is formed between the drive electrode Tx1 and the wiring 300, and a parasitic capacitance may be generated between the drive electrode Tx1 and the wiring 300. When a parasitic capacitance is generated between the driving electrode Tx1 and the wiring 300, for example, when a finger is in contact with the driving electrode Tx1 and the wiring 300 so as to cover them, a touch detection signal is output from the touch detection electrode Rx connected to the wiring 300. Such a phenomenon is called shadow (shadow), and accordingly, a touch detection signal is output from the touch detection electrode Rx arranged at a position different from a position where the finger makes contact, resulting in a decrease in touch detection accuracy. Thus, it is necessary to suppress the generation of parasitic capacitance.
Here, fig. 7 shows a connection portion of the touch detection electrode Rx and the wiring 300. In order to suppress the generation of the parasitic capacitance, as shown in fig. 7, a shield portion (shield pattern) 400 shown in the upper stage of fig. 8, for example, is formed at the root portion of the touch detection electrode Rx connected to the wiring 300. Note that the shield portion 400 is formed of a transparent conductive material such as ITO or IZO, as in the touch detection electrode Rx.
According to the shield part 400, as shown in the lower stage of fig. 8, when the drive signal (drive pulse TxVCOM) is supplied to the drive electrode Tx1, the electric field formed between the drive electrode Tx1 and the wiring 300 can be shielded, and thus the generation of parasitic capacitance can be suppressed.
On the other hand, fig. 9 is a diagram schematically showing an example of the positional relationship between the drive electrodes Tx and the touch detection electrodes Rx in the present embodiment. Note that the following example is shown in fig. 9: the display area DA having the odd-shaped shape in the present embodiment is constituted by a portion 501 corresponding to a rectangular shape (hereinafter, referred to as a rectangular portion) and a portion 502 corresponding to a trapezoidal shape (hereinafter, referred to as an odd-shaped portion).
Note that, in the display area DA having the odd-shaped shape, as in the comparative example of the present embodiment described above, the plurality of driving electrodes Tx are arranged in the X direction so as to extend in the Y direction, and the plurality of touch detection electrodes Rx are arranged in the Y direction so as to extend in the X direction. The plurality of driving electrodes Tx and the plurality of touch detection electrodes Rx are disposed at positions overlapping the display area DA having the irregular shape.
Here, in the special-shaped portion 502, the amount of the touch detection signal output from the touch detection electrode Rx decreases (the touch detection signal becomes small) as the capacitances of the drive electrode Tx and the touch detection electrode Rx (that is, the area of the portion where the drive electrode Tx and the touch detection electrode Rx overlap each other) become smaller than that of the rectangular portion 501.
In the configuration in which the display area DA has the irregular shape, if the shield portion 400 is formed to suppress the occurrence of the parasitic capacitance, the amount of the touch detection signal is further decreased by the influence of the shield portion 400.
That is, in the case where the display area DA has a special shape as described above, even when the shield part 400 is formed on the plurality of touch detection electrodes Rx in order to suppress the occurrence of parasitic capacitance, the touch detection accuracy may be degraded.
Therefore, in the present embodiment, for example, the shield part 400 is formed on a part of the plurality of touch detection electrodes Rx.
Hereinafter, the shield part 400 formed on the touch detection electrode Rx in the present embodiment will be described in detail with reference to fig. 10.
In fig. 10, only a portion of the plurality of driving electrodes Tx and the plurality of touch detection electrodes Rx is illustrated for convenience. In fig. 10, the plurality of driving electrodes Tx arranged in the X direction are referred to as driving electrodes Tx1 to Tx4 in this order from the side close to the wiring 300. In fig. 10, the touch detection electrodes Rx1 to Rx8 are defined as a plurality of touch detection electrodes arranged in the Y direction.
Note that, among the touch detection electrodes Rx1 to Rx8 shown in fig. 10, the touch detection electrodes Rx1 to Rx3 are touch detection electrodes arranged at positions overlapping with the rectangular portion 501, and the touch detection electrodes Rx4 to Rx8 are touch detection electrodes arranged at positions overlapping with the irregularly-shaped portion 502.
In the present embodiment, in the case where the distance between the wiring 300 disposed in the vicinity of the touch detection electrode Rx (one of the plurality of touch detection electrodes Rx) and the driving electrode Tx (for example, the driving electrode Tx1) disposed in the vicinity of the wiring 300 is shorter than a predetermined value, the shield part 400 is formed on the touch detection electrode Rx. Note that the predetermined value is a value that can be distinguished from the distance between the wiring 300 and the driving electrode Tx being short enough to generate parasitic capacitance due to an electric field formed between the wiring 300 and the driving electrode Tx.
Here, as shown in fig. 10, the wirings 300 connected to the touch detection electrodes Rx1 to Rx8 are assumed to be wirings 301 to 308, respectively, and the distance between each of the wirings 301 to 305 and the drive electrode Tx (for example, the drive electrode Tx1) in the wirings 301 to 308 is assumed to be shorter than a predetermined value.
In this case, the shield 400 is formed on each of the touch detection electrodes Rx1 through Rx5 disposed in the vicinity of the wirings 301 through 305. The shield 400 formed on each of the touch detection electrodes Rx1 to Rx5 can shield an electric field formed between the driving electrode Tx1 and each of the wirings 301 to 305.
On the other hand, assume a case where the distances between the wirings 306 to 308 and the driving electrode Tx1 are longer than a predetermined value. In this case, as shown in fig. 10, the shield 400 is not formed on the touch detection electrodes Rx6 through Rx8 disposed near the wirings 306 through 308, respectively. Note that the wirings 306 to 308 are not parallel to the driving electrodes Tx2 to Tx4, but are spaced apart from the driving electrodes Tx2 to Tx4 by a distance equal to or greater than a predetermined value, and therefore the influence of parasitic capacitance generated between the wirings 306 to 308 and the driving electrodes Tx2 to Tx4 is small. Therefore, even when the positional relationship with the driving electrodes Tx2 to Tx4 is considered, the shield part 400 is not formed on the touch detection electrodes Rx6 to Rx 8.
Note that, although the shielding portions 400 are formed on the touch detection electrodes Rx1 to Rx5, the distance between the shielding portion 400 formed on the touch detection electrode Rx1 and the shielding portion 400 formed on the touch detection electrode Rx2 adjacent to the touch detection electrode Rx1 is narrower than a predetermined value.
Further, the size of the shield 400 formed on each of the touch detection electrodes Rx1 through Rx5 differs depending on the distance between the wirings 301 through 305 and the driving electrode Tx 1. Specifically, for example, the size of the shield part 400 formed on the touch detection electrode Rx1 is determined based on the distance between the wiring 301 connected to the touch detection electrode Rx1 and the driving electrode Tx 1. Further, the size of the shield part 400 formed at the touch detection electrode Rx2 is determined according to the distance between the wiring 302 connected to the touch detection electrode Rx2 and the driving electrode Tx1, for example. Here, only the shield part 400 formed on the touch detection electrodes Rx1 and Rx2 will be described, but the same applies to the shield parts 400 formed on the other touch detection electrodes Rx3 to Rx 5.
Note that, for example, in the case where the wirings 301 to 308 are in the positional relationship as shown in fig. 10, the shield parts 400 formed on the respective touch detection electrodes Rx1 to Rx5 are formed so as to gradually increase in the order from the touch detection electrode Rx1 to Rx 5.
That is, in the present embodiment, the shield part 400 formed on each of the touch detection electrodes Rx1 to Rx5 is formed to have an area as large as possible in accordance with the positional relationship with the wirings 301 to 305.
Note that, as described above, the size of the shield part 400 formed on each of the touch detection electrodes Rx1 to Rx5 differs depending on the distance from the wirings 301 to 305 connected to each of the touch detection electrodes Rx1 to Rx5, and for example, the area of the portion where the shield part 400 formed on the touch detection electrode Rx1 and the drive electrode Tx1 overlap each other is substantially the same as the area of the portion where the shield part 400 formed on the touch detection electrode Rx2 and the drive electrode Tx1 overlap each other. Similarly, the area of the portion where the shielding part 400 formed on the touch detection electrode Rx2 and the driving electrode Tx1 overlap each other is substantially the same as the area of the portion where the shielding part 400 formed on the touch detection electrode Rx3 and the driving electrode Tx1 overlap each other. That is, for example, in the rectangular portion 501, the portions where the shield portion 400 and the drive electrode Tx1 overlap each other are substantially the same in each touch detection electrode Rx.
As described above, in the present embodiment, when the distance between the wiring 300 disposed in the vicinity of the touch detection electrode Rx (one of the plurality of second electrodes) and the driving electrode Tx (first electrode) disposed in the vicinity of the wiring 300 is shorter than a predetermined value, the shield part 400 is formed on the touch detection electrode Rx. On the other hand, when the distance between the wiring 300 disposed near the touch detection electrode Rx and the driving electrode Tx disposed near the wiring 300 is longer than a predetermined value, the shielding part 400 is not formed on the touch detection electrode Rx.
In the present embodiment, with such a configuration, for example, the shield 400 formed on the touch detection electrodes Rx1 to Rx5 shields the electric field formed between the drive electrode Tx1 and the wirings 301 to 305, thereby suppressing the generation of parasitic capacitance between the drive electrode Tx1 and the wirings 301 to 305. Since the shield part 400 is not formed on the touch detection electrodes Rx6 to Rx8, the touch detection electrodes Rx6 to Rx8 can avoid a decrease in the signal amount of the touch detection signal due to the influence of the shield part 400.
That is, in the present embodiment, the shield portion 400 is formed in a portion where the influence of the parasitic capacitance generated between the wiring 300 and the driving electrode Tx is large, and the shield portion 400 is not formed in a portion where the influence of the parasitic capacitance generated between the wiring 300 and the driving electrode Tx is small.
In addition, in the present embodiment, the configuration may be such that: the interval between the shield part 400 formed at the touch detection electrode Rx (e.g., the touch detection electrode Rx1) and the shield part 400 formed at the touch detection electrode Rx (e.g., the touch detection electrode Rx2) adjacent to the touch detection electrode Rx is narrower than a predetermined value. With this configuration, the formation of an electric field from between the shield portions 400 formed on the adjacent touch detection electrodes Rx can be suppressed, and the generation of parasitic capacitance can be further suppressed.
Further, in the present embodiment, the size of the shield 400 formed on the touch detection electrode Rx may be different according to the distance between the wiring 300 connected to the touch detection electrode Rx and the driving electrode Tx. With such a configuration, the shield portion 400 on each touch detection electrode Rx is formed as large as possible in accordance with the positional relationship with the wiring 300, whereby the shielding effect of the shield portion 400 can be enhanced and the occurrence of parasitic capacitance can be further suppressed.
In addition, in the present embodiment, the configuration may be such that: the area of the overlapping portion of the shield part 400 formed on the touch detection electrode Rx (e.g., the touch detection electrode Rx1) and the driving electrode Tx (e.g., the driving electrode Tx1) is substantially the same as the area of the overlapping portion of the shield part 400 formed on the other touch detection electrode Rx (e.g., the touch detection electrodes Rx2 and Rx3) and the driving electrode Tx. With this configuration, the area of the portion of the driving electrode Tx that does not overlap the shield 400 (i.e., that is not covered by.
In the present embodiment, the display operation and the touch detection operation for displaying an image in the display area DA are performed in a time-division manner by using the plurality of common electrodes COME for displaying an image in the display area DA as the plurality of driving electrodes Tx for detecting object contact, and thus, the display device 10 can be thinned and the image quality can be improved.
Note that although the shielding part 400 is formed on the touch detection electrodes Rx1 to Rx5 in the above description of fig. 10, the configuration may be such that: for example, the shield part 400 is formed on the touch detection electrodes Rx (for example, the touch detection electrodes Rx1 to Rx3) disposed at positions overlapping the rectangular portion 501 constituting the display area DA, and the shield part 400 is not formed on the touch detection electrodes Rx (for example, the touch detection electrodes Rx4 to Rx8) disposed at positions overlapping the irregular portion 502 constituting the display area DA.
In addition, in fig. 9, when the right end portion of each of the plurality of touch detection electrodes Rx extending in the X direction is a first end portion and the left end portion is a second end portion, the present embodiment has described that all the wirings 300 are connected to the first end portions of the plurality of touch detection electrodes Rx, but as shown in fig. 11, the configuration may be such that: for example, the wiring 300 is connected to the first end of the odd-numbered touch detection electrodes Rx, and the wiring 300 is connected to the second end of the even-numbered touch detection electrodes Rx. Note that, in the present embodiment, since all the wirings 300 are connected to the first end portions of the plurality of touch detection electrodes Rx, the shield portion 400 is formed at the root portions of the touch detection electrodes Rx close to the wirings 300, but in the case of the configuration shown in fig. 11, the shield portion 400 may be formed at one or both of the root portions and the tip portions of the touch detection electrodes Rx.
In addition, in the present embodiment, the display device in which the display area DA (the display panel 11) of the display device 10 has the odd-shaped shape and the display area DA has the rectangular shape is described as a comparative example, but the present embodiment can also be applied to a case where the display area DA does not have the odd-shaped shape (that is, has the rectangular shape, for example). That is, in the present embodiment, if the distance between the wiring 300 disposed in the vicinity of the touch detection electrode Rx and the driving electrode Tx disposed in the vicinity of the wiring 300 is shorter than a predetermined value as described above, the shielding part 400 is formed in the touch detection electrode Rx, and if the distance is longer than the predetermined value, the shielding part 400 is not formed in the touch detection electrode Rx, and the display area DA may not have a special shape.
Note that, although the display device 10 including the touch detection means 12 called an In-cell system is described In the present embodiment, the present embodiment may be realized as a display device including a touch detection means of an On-cell system, for example, or may be realized as a touch panel (touch sensor) for detecting contact or proximity of an object to a predetermined region (touch detection region).
(second embodiment)
Next, a second embodiment will be described. Hereinafter, the same portions as those in the drawings used in the description of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Here, the differences from the first embodiment will be mainly described.
The present embodiment is different from the first embodiment in that: even when the distance between the wiring 300 disposed near the touch detection electrode Rx and the driving electrode Tx disposed near the wiring 300 is longer than a predetermined value, a shield portion is formed at the touch detection electrode Rx.
However, in the above-described fig. 10, since the overlapping areas of the drive electrodes Tx2 to Tx4 and the touch detection electrodes Rx6 to Rx8 are small in the portions where the drive electrodes Tx2 to Tx4 and the touch detection electrodes Rx6 to Rx8 arranged at the positions overlapping the irregularly shaped portion 502, the capacitance between each drive electrode Tx and the touch detection electrode Rx (Tx-Rx) is small.
Here, in the case where an object such as a finger contacts the intersection of the driving electrode Tx2 and the touch detection electrode Rx6, for example, a touch detection signal is output from the touch detection electrode Rx6, and the touch detection signal is input to an a/D converter (not shown) to detect the contact of the object.
However, when the capacitance between the driving electrode Tx2 and the touch detection electrode Rx6 is small due to the shape of the irregularly shaped portion 502 as described above, the touch detection signal value output from the touch detection electrode Rx6 may be smaller than the lower limit (minimum value) of the dynamic range of the a/D converter, and the contact of the object may not be detected.
Here, although the case where an object contacts the intersection of the drive electrode Tx2 and the touch detection electrode Rx6 is described, the same applies to the case where an object contacts the intersection of the drive electrode Tx3 and the touch detection electrode Rx7 and the case where an object contacts the intersection of the drive electrode Tx4 and the touch detection electrode Rx 8.
Therefore, in the present embodiment, as shown in fig. 12, the shield portion 401 (second shield portion) is formed on the touch detection electrodes Rx6 to Rx 8. In this case, the shield 401 is formed at a position not overlapping the drive electrodes Tx2 to Tx 4. Note that the shield portion 401 is formed of a transparent conductive material such as ITO or IZO, as in the shield portion 400.
By forming the shield portion 401 in the touch detection electrode Rx6 in this manner, the capacitance between the driving electrode Tx2 and the touch detection electrode Rx6 can be increased. Further, the shield 401 formed on the touch detection electrode Rx7 can increase the capacitance between the driving electrode Tx3 and the touch detection electrode Rx 7. Further, the shield 401 formed on the touch detection electrode Rx8 can increase the capacitance between the driving electrode Tx4 and the touch detection electrode Rx 8.
Note that the size of the shield portion 401 formed on each of the touch detection electrodes Rx6 to Rx8 differs depending on the distance between the wirings 306 to 308 and the drive electrodes Tx2 to Tx 4. That is, in the present embodiment, the shield 401 formed on each of the touch detection electrodes Rx6 to Rx8 is formed to have an area as large as possible in accordance with the positional relationship with the wirings 306 to 308.
Here, the shield part 401 formed on each of the touch detection electrodes Rx6 to Rx8 is explained, but the shield part 400 (first shield part) formed on each of the other touch detection electrodes Rx1 to Rx5 is the same as that of the first embodiment, and thus a detailed explanation thereof is omitted here.
As described above, in the present embodiment, when the distance between the wiring 300 disposed in the vicinity of the touch detection electrode Rx and the driving electrode Tx disposed in the vicinity of the wiring 300 is longer than a predetermined value, the shield 401 (second shield) is formed in the touch detection electrode Rx.
In the present embodiment, with such a configuration, since the capacitance between the drive electrode Tx and the touch detection electrode Rx in the irregular portion 502 can be increased by the shield portion 401, the variation in capacitance between the drive electrode Tx and the touch detection electrode Rx in the display area DA (display panel 11) can be reduced, and the touch detection accuracy can be improved.
In the present embodiment, the shield portion 401 is formed at a position not overlapping the driving electrodes Tx (for example, the driving electrodes Tx2 to Tx4), so that it is possible to prevent the amount of the touch detection signal from being reduced by the influence of the shield portion 401.
In addition, in the present embodiment, the configuration may be such that: the size of the shield 401 formed on the touch detection electrode Rx is different according to the distance between the wiring 300 disposed near the touch detection electrode Rx and the driving electrode Tx disposed near the wiring 300. According to such a configuration, by forming the shield portion 401 on each touch detection electrode Rx as large as possible in accordance with the positional relationship with the wiring 300, it is possible to further increase the capacitance between the drive electrode Tx and the touch detection electrode Rx at the irregularly shaped portion 502.
Here, in the first embodiment, although the description has been made on the basis of the point that the influence of the generation of the parasitic capacitance at the drive electrodes Tx2 to Tx4 and the like is small, the shield portion is not formed at the touch detection electrodes Rx6 to Rx8, but the parasitic capacitance may be generated between the wirings 306 to 308 and the drive electrodes Tx2 to Tx 4. Therefore, in the present embodiment, as shown in fig. 13, for example, the shield portion 401 may be formed at a position overlapping the driving electrode Tx.
According to such a constitution, the capacitance between the drive electrode Tx and the touch detection electrode Rx at the irregularly shaped portion 502 is increased, and it is also expected that the generation of the parasitic capacitance between the wiring 300 and the drive electrode Tx is suppressed.
In this case, the area of the portion where the shield portion 401 and the drive electrode Tx overlap each other is smaller than the area of the portion where the shield portion 400 and the drive electrode Tx overlap each other, so that the decrease in the signal amount of the touch detection signal due to the influence of the shield portion 401 can be suppressed.
Hereinafter, the invention according to the present embodiment will be described.
[C1]
A display device which displays an image in a display area, comprising:
a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings and detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
a shield portion is formed at the second electrode when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value,
when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is longer than a predetermined value, the shielding portion is not formed in the second electrode.
[C2]
The display device according to [ C1], wherein a distance between the shielding portion formed in the second electrode and the shielding portion formed in a second electrode adjacent to the second electrode is narrower than a predetermined value.
[C3]
The display device according to [ C1], wherein the size of the shielding portion formed on the second electrode differs depending on a distance between a wiring connected to the second electrode and the first electrode arranged in the vicinity of the wiring.
[C4]
The display device according to [ C1], wherein an area of a portion where the shielding portion formed in the second electrode and the first electrode overlap each other is substantially the same as an area of a portion where the shielding portion formed in the other second electrode and the first electrode overlap each other.
[C5]
The display device according to [ C1], wherein a plurality of common electrodes for displaying an image in the display region are used as the plurality of first electrodes.
[C6]
A display device which displays an image in a display area, comprising:
a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings and detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
a first shielding portion is formed at the second electrode in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value,
a second shielding portion formed on the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
the first shielding part is formed at a position overlapping with the first electrode,
the second shield portion is formed at a position not overlapping with the first electrode.
[C7]
A display device which displays an image in a display area, comprising:
a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings and detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
a first shielding portion is formed at the second electrode in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value,
a second shielding portion formed on the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
an area of a portion where the second shield portion and the first electrode overlap each other is smaller than an area of a portion where the first shield portion and the first electrode overlap each other.
[C8]
The display device according to any one of [ C1] to [ C7], wherein the display region has a shape different from a rectangular shape.
[C9]
A touch panel is provided with:
a plurality of first electrodes that overlap the touch detection area and are arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings and detecting a contact or approach of an object to the touch detection area based on electrostatic capacitances between the plurality of first electrodes and the plurality of second electrodes,
a shield portion is formed at the second electrode when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value,
when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is longer than a predetermined value, the shielding portion is not formed in the second electrode.
[C10]
The touch panel according to [ C9], wherein a distance between the shield portion formed in the second electrode and the shield portion formed in the second electrode adjacent to the second electrode is narrower than a predetermined value.
[C11]
The touch panel according to [ C9], wherein the size of the shield portion formed on the second electrode differs depending on a distance between a wiring connected to the second electrode and the first electrode disposed in the vicinity of the wiring.
[C12]
The touch panel according to [ C9], wherein an area of a portion where the shielding portion formed in the second electrode and the first electrode overlap each other is substantially the same as an area of a portion where the shielding portion formed in the other second electrode and the first electrode overlap each other.
[C13]
A touch panel is provided with:
a plurality of first electrodes that overlap the touch detection area and are arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings and detecting a contact or approach of an object to the touch detection area based on electrostatic capacitances between the plurality of first electrodes and the plurality of second electrodes,
a first shielding portion is formed at the second electrode in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value,
a second shielding portion formed on the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
the first shielding part is formed at a position overlapping with the first electrode,
the second shield portion is formed at a position not overlapping with the first electrode.
[C14]
A touch panel is provided with:
a plurality of first electrodes that overlap the touch detection area and are arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings and detecting a contact or approach of an object to the touch detection area based on electrostatic capacitances between the plurality of first electrodes and the plurality of second electrodes,
a first shielding portion is formed at the second electrode in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is shorter than a predetermined value,
a second shielding portion formed on the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
an area of a portion where the second shield portion and the first electrode overlap each other is smaller than an area of a portion where the first shield portion and the first electrode overlap each other.
[C15]
The touch panel according to any one of [ C9] to [ C14], wherein the touch detection region has a shape different from a rectangular shape.
While several embodiments of the invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications are included in the scope and spirit of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.
Description of the reference numerals
Tx: driving electrode (first electrode)
Rx: touch detection electrode (second electrode)
10: display device
11: display panel
12: touch detection mechanism
13: backlight unit
111: first substrate
112: second substrate
113: panel driver
121: touch detection driver
300: wiring
400. 401: a shield portion.

Claims (15)

1. A display device which displays an image in a display area, comprising:
a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings, detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
a shield portion is formed at one of the plurality of second electrodes when a distance between a wiring arranged in the vicinity of the one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring of the plurality of first electrodes is shorter than a predetermined value,
when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is longer than a predetermined value, the shielding portion is not formed in the second electrode.
2. The display device according to claim 1,
the interval between the shielding part formed on the second electrode and the shielding part formed on the second electrode adjacent to the second electrode is narrower than a predetermined value.
3. The display device according to claim 1,
the size of the shield portion formed on the second electrode is different according to the distance between the wiring connected to the second electrode and the first electrode disposed in the vicinity of the wiring.
4. The display device according to claim 1,
the area of a portion where the shielding portion formed on the second electrode and the first electrode overlap each other is the same as the area of a portion where the shielding portion formed on the other second electrode and the first electrode overlap each other.
5. The display device according to claim 1,
a plurality of common electrodes for displaying an image in the display area are used as the plurality of first electrodes.
6. A display device which displays an image in a display area, comprising:
a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings, detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring of the plurality of first electrodes is shorter than a predetermined value, a first shielding portion is formed at the second electrode,
a second shielding portion formed at the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
the first shield portion is formed at a position overlapping the first electrode,
the second shield portion is formed at a position not overlapping with the first electrode.
7. A display device which displays an image in a display area, comprising:
a plurality of first electrodes overlapping the display region and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the display region and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings, detecting contact or approach of an object to the display area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring of the plurality of first electrodes is shorter than a predetermined value, a first shielding portion is formed at the second electrode,
a second shielding portion formed at the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
the area of the overlapping portion of the second shielding portion and the first electrode is smaller than the area of the overlapping portion of the first shielding portion and the first electrode.
8. The display device according to any one of claims 1 to 7,
the display area has a shape different from a rectangular shape.
9. A touch panel is provided with:
a plurality of first electrodes overlapping the touch detection area and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings, detecting contact or proximity of an object to the touch detection area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
a shield portion is formed at one of the plurality of second electrodes when a distance between a wiring arranged in the vicinity of the one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring of the plurality of first electrodes is shorter than a predetermined value,
when a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring among the plurality of first electrodes is longer than a predetermined value, the shielding portion is not formed in the second electrode.
10. The touch panel according to claim 9,
the interval between the shielding part formed on the second electrode and the shielding part formed on the second electrode adjacent to the second electrode is narrower than a predetermined value.
11. The touch panel according to claim 9,
the size of the shield portion formed on the second electrode is different according to the distance between the wiring connected to the second electrode and the first electrode disposed in the vicinity of the wiring.
12. The touch panel according to claim 9,
the area of a portion where the shielding portion formed on the second electrode and the first electrode overlap each other is the same as the area of a portion where the shielding portion formed on the other second electrode and the first electrode overlap each other.
13. A touch panel is provided with:
a plurality of first electrodes overlapping the touch detection area and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings, detecting contact or proximity of an object to the touch detection area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring of the plurality of first electrodes is shorter than a predetermined value, a first shielding portion is formed at the second electrode,
a second shielding portion formed at the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
the first shield portion is formed at a position overlapping the first electrode,
the second shield portion is formed at a position not overlapping with the first electrode.
14. A touch panel is provided with:
a plurality of first electrodes overlapping the touch detection area and arranged in a second direction intersecting the first direction so as to extend in the first direction;
a plurality of second electrodes overlapping the touch detection area and arranged in the first direction so as to extend in the second direction;
a plurality of wirings arranged along the plurality of first electrodes and connected to the plurality of second electrodes, respectively; and
a touch detection driver connected to the plurality of wirings, detecting contact or proximity of an object to the touch detection area based on electrostatic capacitance between the plurality of first electrodes and the plurality of second electrodes,
in a case where a distance between a wiring arranged in the vicinity of one of the plurality of second electrodes and a first electrode arranged in the vicinity of the wiring of the plurality of first electrodes is shorter than a predetermined value, a first shielding portion is formed at the second electrode,
a second shielding portion formed at the second electrode when a distance between a wiring arranged in the vicinity of one of the second electrodes and a first electrode arranged in the vicinity of the wiring among the first electrodes is longer than a predetermined value,
the area of the overlapping portion of the second shielding portion and the first electrode is smaller than the area of the overlapping portion of the first shielding portion and the first electrode.
15. The touch panel according to any one of claims 9 to 14,
the touch detection area has a shape different from a rectangular shape.
CN201910859430.1A 2018-09-11 2019-09-11 Display device and touch panel Active CN110888548B (en)

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US20200081576A1 (en) 2020-03-12
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